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ASF GitHub Bot logged work on BEAM-7750: ---------------------------------------- Author: ASF GitHub Bot Created on: 24/Jul/19 22:11 Start Date: 24/Jul/19 22:11 Worklog Time Spent: 10m Work Description: ostrokach commented on issue #9146: [BEAM-7750] Don't map transforms to PubSub subscriptions unless necessary URL: https://github.com/apache/beam/pull/9146#issuecomment-514818679 Run Python PreCommit ---------------------------------------------------------------- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. For queries about this service, please contact Infrastructure at: us...@infra.apache.org Issue Time Tracking ------------------- Worklog Id: (was: 282320) Time Spent: 1h 40m (was: 1.5h) > Pipeline instances are not garbage collected > -------------------------------------------- > > Key: BEAM-7750 > URL: https://issues.apache.org/jira/browse/BEAM-7750 > Project: Beam > Issue Type: Bug > Components: sdk-py-core > Affects Versions: 2.14.0 > Environment: OS: Debian rodete. > Tested using: > Beam versions: 2.13.0, 2.15.0.dev > Python versions: Python 2.7, Python 3.7. > Runners: DirectRunner, DataflowRunner. > Reporter: Alexey Strokach > Priority: Minor > Time Spent: 1h 40m > Remaining Estimate: 0h > > It seems that Apache Beam's Pipeline instances are not garbage collected, > even if the pipelines are finished or cancelled and there are no references > to those pipelines in the Python interpreter. > For pipelines executed in a script, this is not a problem. However, for > interactive pipelines executed inside a Jupyter notebook, this limits how > well we can track and remove the dependencies of those pipelines. For > example, if a pipeline reads from some cache, it would be nice to be able to > delete that cache once there are no references to it from pipelines or the > global namespace. > The issue can be reproduced using the following script: > [https://gist.github.com/ostrokach/a16556dc77c96b87fe23c2fbd8fb6346]. > ----- > On further examination, turns out that this is due to the > [{{_PubSubReadEvaluator._subscription_cache}}|https://github.com/apache/beam/blob/27bb5bc7b244809e7f6022adb2730d10204ce4d3/sdks/python/apache_beam/runners/direct/transform_evaluator.py#L418] > class attribute keeping references to all {{ReadFromPubSub}} transforms. -- This message was sent by Atlassian JIRA (v7.6.14#76016)